The WordPress content editor will always show you the ‘Visual’ tab by default. If you are one of the many people who have problems with the visual editor stripping out your HTML tags or attributes, this can quickly get very annoying – every time you load a post to make changes, it lands on the Visual tab and has all your nice HTML removed.

Here’s a simple line of code that you can add to your theme’s functions.php file to ensure that it always lands on the HTML tab by default (you will still have the option of switching to the Visual tab of course):

add_filter( 'wp_default_editor', create_function('', 'return "html";') );